Issn: 2776-0979, Volume 3, Issue 12, Dec., 2022 88 determination of sound velocity in different gases using innovative devices
ISSN: 2776-0979, Volume 3, Issue 12, Dec., 2022
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2926-Article Text-5618-1-10-20221209
ISSN: 2776-0979, Volume 3, Issue 12, Dec., 2022 90 To avoid unintended loss of gas, turn the handwheel of the fine regulating valve to the right stop before screwing the fine regulating valve on the gas can. Any leakage of the measuring apparatus leads to an escape of gas and thus to a distortion of the measuring result; therefore the tweeter has to be placed as close to the plastic tube as possible. In order to fill the plastic tube with carbon dioxide, put the silicone tubing on the lower hose nipple of the plastic tube. In this way, the gas is almost completely exchanged because the lighter air is pressed out through the upper hose nipple when carbon dioxide enters. Correspondingly, proceed the other way round when filling the plastic tube with the noble gases helium and neon: when helium or neon, respectively, enters through the upper hose nipple, the air, which is heavier, is pressed out through the lower hose nipple. Concerning the measurements on helium and neon, keep in mind that the measuring apparatus cannot be perfectly sealed so that part of the highly-volatile gas in the plastic tube escapes. This results in a relatively high proportion of air, which distorts the measurements – therefore the measurements should be carried out quickly. Carrying out the experiment First, the effective measuring distance is determined s eff : *Insert the multipurpose microphone in the plastic tube by approx. 1 cm, read the position s A1 , and write it in the first line of the table. Write the travel time Δt A1 in the table with . Repeat the measurement of the travel time several times to improve the accuracy of measurement. *Insert the multipurpose microphone entirely in the plastic tube, read the position s A2 , and write it in the next line of the table. Write the travel time Δt A1 in the table with . Repeat the measurement of the travel time several times to improve the accuracy of measurement. *In order to determine the average travel times t 1 and t 2 , select Draw Mean , and determine the velocity of sound in air c air = Δs/Δt = (s A1 -s A2 )/(t 1 -t 2 ). *Determine the effective measuring distance s eff = c air · t 1 ; for this enter the determined travel times t 1 and t 2 in the Settings seff (right mouse button on s eff ) in the formula (s A1 -s A2 )/(t 1 -t 2 )*t 1 . Now the velocity of sound in carbon dioxide, helium and neon can be measured directly: |
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